In the present work the growth of potassium dihydrogen phosphate crystal doped with nicotinic acid at various concentrations is reported. KDP is a well -known optical material having different applications in electro-optics and laser technology. Nicotinic acid doped KDP crystal is grown using slow solvent evaporation technique. The doping of nicotinic acid at various concentrations was successively achieved in KDP crystal and confirmed by Fourier transform infrared spectroscopy analysis. The modification of optical transmittance and other optical constants of KDP crystal due to the doping of nicotinic acid have been investigated by means of UV-visible spectral analysis. The dielectric behavior of the sample has been studied. The variation of the dielectric loss with frequency of the applied field is reported.
This paper presents a new non machining method of hole-making in Glass Fiber Reinforced Plastic Composite laminates which gives high quality holes than traditional machining methods of hole making. The material used for this study was made by simple hand lay up method and thickness was maintained around 4 mm. The holes were made by fine blanking process and the defects mainly delamination (delamination factor) was measured by ultrasonic C scan imaging method. By fixing a resolution of 0.5 mm on both of the scanning axis, the image and the amplitude of the interface echo were acquired. Then by applying nudge control and image analysis the value of delamination factor was calculated for all the samples. Also compared to the traditional hole making process, the fine blanking method gives lower value of delamination factor leading to good hole quality.
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